Subject:
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Re: Using NXT Port 4 EIA-485
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Mon, 16 Apr 2007 21:08:13 GMT
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Viewed:
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17721 times
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Christian Mock wrote:
> Hi,
> is there currently any software-support (pbLua, NXT-G, NXJ) for NXT Port4
> highspeed serial communication (EIA-485) ?
> This port can be used for connecting some new hardware (camera, SD-Card-storage)
> to the NXT...
Christian,
There is currently no direct support for this in pbLua, but it's not
too hard to add. The HighSpeed port is port 4, and it has basically
3 wires that control how it works.
PA4/5 are the RX and TX to UART0 right on the ARM
PA7 is RTS from the UART0, and basically it controls the direction
of the 485 driver.
To use the 485 port, you need to make sure that the DIG0/1 lines
on that port are set to INPUT, or you'll end up fighting between the
DIG0/1 and the 485 driver.
I'll look at doing something on this soon, but keep a few things
in mind.
1. This is NOT an SPI interface - which is what the SD cards need
2. It's a simple half duplex serial port, so any complex comms
will need a protocol wrapped around it.
3. It should still be possible to bit-bang the I/O lines, but you
won't get true SPI out of it since you need CLK, MOSI, MISO for
SPI.
Ralph
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Message has 1 Reply:
 | | Re: Using NXT Port 4 EIA-485
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| (...) Ralph, I'm using an ATMega8 as frontend processor between NXT and SD-Card. Step1: NXT===>I2C===>ATMega...==>SD-Card Disadvantage: Very low speed (9600) Step2: NXT===>EIA-485===>AT...==>SD-Card This should work in an easy way, FAT-Support for (...) (17 years ago, 17-Apr-07, to lugnet.robotics.nxt)
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Message is in Reply To:
| | Using NXT Port 4 EIA-485
|
| Hi, is there currently any software-support (pbLua, NXT-G, NXJ) for NXT Port4 highspeed serial communication (EIA-485) ? This port can be used for connecting some new hardware (camera, SD-Card-storage) to the NXT... Thanks for more informations Bye (...) (17 years ago, 7-Apr-07, to lugnet.robotics.nxt)
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